Have the Bergs model got that horrible coupler set up their red rattlers have?
One of Berg's pictures of their U-sets, see: (oops posting the link might help!) http://www.bergshobbies.com.au/images/catalogue/IMG_4965%20Set%20No.%20536.JPG
For the Berg's Red rattler & related cars, while it is incorrect, and still stands out, if you search for some pictures/videos, it doesn't seem to be stand out that much.
Main part of this post is, which would be more accurate (not counting compromises that need to be made) out of
1. Original windows: SRM or Bergs?
2. Beclawat windows: SRM or Bergs?